MAX8671XETL+ Maxim Integrated Products, MAX8671XETL+ Datasheet - Page 41

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MAX8671XETL+

Manufacturer Part Number
MAX8671XETL+
Description
IC PMIC W/CHARGER 40-TQFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8671XETL+

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
Voltage - Supply
4.1 V ~ 6.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
40-WFQFN Exposed Pad
Mounting Style
SMD/SMT
Input Voltage
2.6 V to 6.6 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Output Current
0.5 A
Output Voltage
0.6 V to 5 V
Supply Current
0.285 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
THM threshold adjustment can be accommodated by
changing R
parallel with the thermistor, or using a thermistor with dif-
ferent material constant (β). For example, a +45°C hot
threshold and 0°C cold threshold can be realized by
using a 10kΩ thermistor with a β of 4250K and connect-
ing 120kΩ in parallel. Since the thermistor resistance
near 0°C is much higher than it is near +50°C, a large
parallel resistance lowers the cold threshold, while only
slightly lowering the hot threshold. Conversely, a small
series resistance raises the cold threshold, while only
slightly raising the hot threshold. Raising R
both the hot and cold thresholds, while lowering R
raises both thresholds.
Good printed circuit board (PCB) layout is necessary to
achieve optimal performance. Refer to the MAX8671
evaluation kit for Maxim’s recommended layout.
Use the following guidelines for the best results:
• Use short and wide traces for high-current and dis-
• The step-down regulator power inputs are critical
• Minimize the area of the loops formed by the step-
• The exposed paddle (EP) is the main path for heat
• The MAX8671X regulator feedback nodes are sensi-
• The thermistor node is high impedance and should
• Make power ground connections to a power ground
continuous current paths.
discontinuous current paths that require careful
bypassing. Place the step-down regulator input
bypass capacitors as close as possible to each
switching regulator power input pair (PV_ to PG_).
down converters’ dynamic switching currents.
to exit the IC. Connect EP to the ground plane with
thermal vias to allow heat to dissipate from the
device.
tive high-impedance nodes. Keep these nodes as
short as possible and away from the inductors.
be routed with care.
plane. Make analog ground connections to an ana-
log ground plane. Connect the ground planes at a
single point.
Smart Power Selector for Handheld Devices
TB
, connecting a resistor in series and/or in
______________________________________________________________________________________
PCB Layout and Routing
PMIC with Integrated Charger and
TB
lowers
TB
• The REG4 LDO is a high-performance LDO with
• BP is a high impedance node and leakage current
The top of the MAX8671X package is laser etched as
shown in Figure 15:
• “8671XETL” is the product identification code. The
• “yww” is a date code. “y” is the last number in the
Figure 15. Package Marking Example
PROCESS: BiCMOS
high PSRR and low noise and care should be used
in the layout to obtain the high performance.
Generally, the REG4 LDO is powered from a step-
down regulator output, and therefore, its input
capacitor should be bypassed to the power ground
plane. However, its output capacitor should be
bypassed to the analog ground plane.
into or out of BP can affect the LDO output accuracy.
full part number is MAX8671XETL; however, in this
case, the “MAX” prefix is omitted due to space
limitations.
Gregorian calendar year. “ww” is the week number
in the Gregorian calendar. For example:
“801” is the first week of 2008; the week of
January 1st, 2008
“052” is the fifty-second week of 2010; the
week of December 27th, 2010.
“aaaa” is an assembly code and lot code.
“+” denotes lead-free packaging and marks
the pin 1 location.
TOP VIEW
5mm x 5mm x 0.8mm
+ aaaa
8671XE
THIN QFN
TLyww
Package Marking
Chip Information
41

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